442 Dr. J. E. Gray on new Genera and Species of 
LEMNALIA. 
Coral soft, fleshy, formed of numerous clustered, small, 
cylindrical tubes ; the outer surface is smooth, destitute of any 
. appearance of spicules, but showing by grooves the places of: 
union of the different tubes that form the mass, each tube 
ending in a polype. The base is broad, expanded horizon- 
tally, fleshy like the coral, throwing up several stems, which 
are irregularly branched, the lateral branches being somewhat 
two-rowed, the terminal branchlets rather clustered, each 
branchlet ending in a short cylindrical polype, the mouth and 
tentacles of which are completely retractile, only leaving a 
central knob surrounded by eight slightly depressed radiating 
grooves, and entirely destitute of any appearance of superficial 
spicules. ‘The whole coral is flaccid, and the larger branches 
appear to be more or less compressed; but this may in great 
part depend on the state of the specimen. 
Lemnalia Jukesti. Fig. 1. 
Hab. 2? (J. Jukes, Esq.) 
Ammothea thrysoides, Hempr. & Ehrenb. (Ehrenb. Corall. 
r. M. 59), from the Red Sea, may be another species of this 
enus. 
Prof. Ehrenberg, in his ‘ Corals of the Red Sea,’ separates 
the genus Ammothea from Nephthya, because the former is 
said not to have, and the latter to have, fusiform spicules on 
the polype. The types are A. virescens and Nephthya Chabrolii, 
Audouin, both from Savigny’s beautiful figures in the great 
work on Egypt, t.2. f.5 &6; but, if the figures are examined, it 
will be found that Savigny represents the polype-cells of both 
species as covered externally with fusiform spicules, the spi- 
cules in Ammothea being only smaller than those of Nephthya. 
Prof. Ehrenberg says that he has examined many specimens 
